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Finding the Fourth Proportional to 142.03, 212.75 and 84.07

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Solution

The fourth proportional to 142.03, 212.75 and 84.07 is: 125.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    142.03 : 212.75 = 84.07 : x
  2. Step 2: Convert to fraction form
    142.03/212.75 = 84.07/x
  3. Step 3: Cross multiply
    142.03x = 212.75 × 84.07
  4. Step 4: Simplify right side
    142.03x = 17,885.47
  5. Step 5: Solve for x
    x = 17,885.47/142.03
  6. Step 6: Final answer
    x = 125.93

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.